Initial Helioseismic Observations by Hinode/SOT

TL;DR

This paper reports initial helioseismic observations from Hinode's Solar Optical Telescope, demonstrating high-resolution data analysis capabilities that reveal subsurface solar structures and extend the observable oscillation spectrum.

Contribution

First demonstration of helioseismic analysis using Hinode/SOT intensity data, revealing high-resolution subsurface solar features and extending the oscillation spectrum.

Findings

Subsurface supergranular patterns observed.

Oscillation spectrum extended to higher frequencies and wavenumbers.

Time-distance analysis shows potential for high-resolution helioseismology.

Abstract

Results from initial helioseismic observations by Solar Optical Telescope onboard Hinode are reported. It has been demonstrated that intensity oscillation data from Broadband Filter Imager can be used for various helioseismic analyses. The k-omega power spectra, as well as corresponding time-distance cross-correlation function that promises high-resolution time-distance analysis below 6-Mm travelling distance, were obtained for G-band and CaII-H data. Subsurface supergranular patterns have been observed from our first time-distance analysis. The results show that the solar oscillation spectrum is extended to much higher frequencies and wavenumbers, and the time-distance diagram is extended to much shorter travel distances and times than they were observed before, thus revealing great potential for high-resolution helioseismic observations from Hinode.